Hello,
Using Godot Mono v3.2.3 and the PlayerIO NuGet package, on connect I receive "The URI prefix is not recognized". This doesn't happen on my dev machine but on two other Windows 10 machines with a debug compiled copy. I get warnings about bcrypt.dll, I'm not sure if that is related. At a later point I can post the exception dump.
FIXED: Godot issue, missing data folder included with the exe.